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<li class="navelem"><a class="el" href="dir_5956a3e80a20e8e03eb577bedb92689f.html">gpu</a></li><li class="navelem"><a class="el" href="dir_5865795754b604b902e524ed1add5694.html">utils</a></li>  </ul>
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<div class="title">Transpose.cuh</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * This source code is licensed under the MIT license found in the</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &quot;../../FaissAssert.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &quot;Tensor.cuh&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &quot;DeviceUtils.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &quot;StaticUtils.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;cuda.h&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu {</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> IndexT&gt;</div>
<div class="line"><a name="l00020"></a><span class="lineno"><a class="line" href="structfaiss_1_1gpu_1_1TensorInfo.html">   20</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1gpu_1_1TensorInfo.html">TensorInfo</a> {</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;  <span class="keyword">static</span> constexpr <span class="keywordtype">int</span> kMaxDims = 8;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;  T* data;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;  IndexT sizes[kMaxDims];</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;  IndexT strides[kMaxDims];</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  <span class="keywordtype">int</span> dims;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;};</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> IndexT, <span class="keywordtype">int</span> Dim&gt;</div>
<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="structfaiss_1_1gpu_1_1TensorInfoOffset.html">   30</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1gpu_1_1TensorInfoOffset.html">TensorInfoOffset</a> {</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;  __device__ <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <span class="keyword">get</span>(<span class="keyword">const</span> <a class="code" href="structfaiss_1_1gpu_1_1TensorInfo.html">TensorInfo&lt;T, IndexT&gt;</a>&amp; info,</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;                                            IndexT linearId) {</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    IndexT offset = 0;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">#pragma unroll</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = Dim - 1; i &gt;= 0; --i) {</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;      IndexT curDimIndex = linearId % info.sizes[i];</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;      IndexT curDimOffset = curDimIndex * info.strides[i];</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;      offset += curDimOffset;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;      <span class="keywordflow">if</span> (i &gt; 0) {</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        linearId /= info.sizes[i];</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;      }</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    }</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keywordflow">return</span> offset;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;  }</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;};</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> IndexT&gt;</div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="structfaiss_1_1gpu_1_1TensorInfoOffset_3_01T_00_01IndexT_00-1_01_4.html">   52</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1gpu_1_1TensorInfoOffset.html">TensorInfoOffset</a>&lt;T, IndexT, -1&gt; {</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;  __device__ <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <span class="keyword">get</span>(<span class="keyword">const</span> <a class="code" href="structfaiss_1_1gpu_1_1TensorInfo.html">TensorInfo&lt;T, IndexT&gt;</a>&amp; info,</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;                                            IndexT linearId) {</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    <span class="keywordflow">return</span> linearId;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;  }</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;};</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> IndexT, <span class="keywordtype">int</span> Dim&gt;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<a class="code" href="structfaiss_1_1gpu_1_1TensorInfo.html">TensorInfo&lt;T, IndexT&gt;</a> getTensorInfo(<span class="keyword">const</span> <a class="code" href="classfaiss_1_1gpu_1_1Tensor.html">Tensor&lt;T, Dim, true&gt;</a>&amp; t) {</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  <a class="code" href="structfaiss_1_1gpu_1_1TensorInfo.html">TensorInfo&lt;T, IndexT&gt;</a> info;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; Dim; ++i) {</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    info.sizes[i] = (IndexT) t.<a class="code" href="classfaiss_1_1gpu_1_1Tensor.html#a6699c311648457f257afa340c61f417c">getSize</a>(i);</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    info.strides[i] = (IndexT) t.<a class="code" href="classfaiss_1_1gpu_1_1Tensor.html#a0b8bba630f7a1fa217f90b20d298420a">getStride</a>(i);</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;  }</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;  info.data = t.<a class="code" href="classfaiss_1_1gpu_1_1Tensor.html#a50411ce4d0fa32ef715e3321b6e33212">data</a>();</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  info.dims = Dim;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  <span class="keywordflow">return</span> info;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;}</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> IndexT, <span class="keywordtype">int</span> DimInput, <span class="keywordtype">int</span> DimOutput&gt;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;__global__ <span class="keywordtype">void</span> transposeAny(TensorInfo&lt;T, IndexT&gt; input,</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                             TensorInfo&lt;T, IndexT&gt; output,</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                             IndexT totalSize) {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;  <span class="keywordflow">for</span> (IndexT i = blockIdx.x * blockDim.x + threadIdx.x;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;       i &lt; totalSize;</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;       i += gridDim.x + blockDim.x) {</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    <span class="keyword">auto</span> inputOffset = TensorInfoOffset&lt;T, IndexT, DimInput&gt;::get(input, i);</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="keyword">auto</span> outputOffset = TensorInfoOffset&lt;T, IndexT, DimOutput&gt;::get(output, i);</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="preprocessor">#if __CUDA_ARCH__ &gt;= 350</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="preprocessor"></span>    output.data[outputOffset] = __ldg(&amp;input.data[inputOffset]);</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="preprocessor"></span>    output.data[outputOffset] = input.data[inputOffset];</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="preprocessor"></span>  }</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;}</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">/// Performs an out-of-place transposition between any two dimensions.</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment">/// Best performance is if the transposed dimensions are not</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment">/// innermost, since the reads and writes will be coalesced.</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment">/// Could include a shared memory transposition if the dimensions</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment">/// being transposed are innermost, but would require support for</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment">/// arbitrary rectangular matrices.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment">/// This linearized implementation seems to perform well enough,</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment">/// especially for cases that we care about (outer dimension</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment">/// transpositions).</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keywordtype">int</span> Dim&gt;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="keywordtype">void</span> runTransposeAny(Tensor&lt;T, Dim, true&gt;&amp; in,</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;                     <span class="keywordtype">int</span> dim1, <span class="keywordtype">int</span> dim2,</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;                     Tensor&lt;T, Dim, true&gt;&amp; out,</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;                     cudaStream_t stream) {</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;  static_assert(Dim &lt;= TensorInfo&lt;T, unsigned int&gt;::kMaxDims,</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;                <span class="stringliteral">&quot;too many dimensions&quot;</span>);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;  FAISS_ASSERT(dim1 != dim2);</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;  FAISS_ASSERT(dim1 &lt; Dim &amp;&amp; dim2 &lt; Dim);</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;  <span class="keywordtype">int</span> outSize[Dim];</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; Dim; ++i) {</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    outSize[i] = in.getSize(i);</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;  }</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;  std::swap(outSize[dim1], outSize[dim2]);</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; Dim; ++i) {</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    FAISS_ASSERT(out.getSize(i) == outSize[i]);</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;  }</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;  <span class="keywordtype">size_t</span> totalSize = in.numElements();</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;  <span class="keywordtype">size_t</span> block = std::min((<span class="keywordtype">size_t</span>) getMaxThreadsCurrentDevice(), totalSize);</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;  <span class="keywordflow">if</span> (totalSize &lt;= (<span class="keywordtype">size_t</span>) std::numeric_limits&lt;int&gt;::max()) {</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="comment">// div/mod seems faster with unsigned types</span></div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="keyword">auto</span> inInfo = getTensorInfo&lt;T, unsigned int, Dim&gt;(in);</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <span class="keyword">auto</span> outInfo = getTensorInfo&lt;T, unsigned int, Dim&gt;(out);</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    std::swap(inInfo.sizes[dim1], inInfo.sizes[dim2]);</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    std::swap(inInfo.strides[dim1], inInfo.strides[dim2]);</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    <span class="keyword">auto</span> grid = std::min(utils::divUp(totalSize, block), (<span class="keywordtype">size_t</span>) 4096);</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    transposeAny&lt;T, <span class="keywordtype">unsigned</span> int, Dim, -1&gt;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;      &lt;&lt;&lt;grid, block, 0, stream&gt;&gt;&gt;(inInfo, outInfo, totalSize);</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    <span class="keyword">auto</span> inInfo = getTensorInfo&lt;T, unsigned long, Dim&gt;(in);</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    <span class="keyword">auto</span> outInfo = getTensorInfo&lt;T, unsigned long, Dim&gt;(out);</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    std::swap(inInfo.sizes[dim1], inInfo.sizes[dim2]);</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    std::swap(inInfo.strides[dim1], inInfo.strides[dim2]);</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    <span class="keyword">auto</span> grid = std::min(utils::divUp(totalSize, block), (<span class="keywordtype">size_t</span>) 4096);</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    transposeAny&lt;T, <span class="keywordtype">unsigned</span> long, Dim, -1&gt;</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;      &lt;&lt;&lt;grid, block, 0, stream&gt;&gt;&gt;(inInfo, outInfo, totalSize);</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;  }</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;  CUDA_TEST_ERROR();</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;}</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;} } <span class="comment">// namespace</span></div>
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